I have this specific schematic unfortunately it's for a different model, and very hard to make out some of the resistors and their values. It doesn't line up with the specific amp I'm looking for, an older 1200 power amp model maybe from the late 80s? Not to sure of the time frame.

If you look at the schematic posted on ebay you can see the values of the resistors in question.r25=470 ohm 2 wattr58=6.8k 2 wattr60=3.6k 2 wattI see a resistor across D1 which has the markings for a bridge it value is 6.2k 5 wattmaybe this is what you need.